reflection, When light hits a mirror, Refraction, when Light passes through a lens, opaque, something that light doesn't pass through, translucent, lets some light through, transparent, lets all light through, convex, type of lens that focusses light, concave, type of lens that splits light, gamma waves, part of the EM spectrum that can kill bacteria from food, ultraviolet, part of the EM spectrum that causes sunburn, infrared, part of the EM spectrum that is used in remote controls.

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